Originally Posted by
pa_sjo
The CO pot only adjusts the idle mixture though, you can't adjust 'the mixture' as a whole, well not unless you're remapping it or being cowboy with the fuel pressure
Yeah, on "normal" EFi systems like this you can't really properly adjust the mixture.
Adjusting the screw mentioned above will only have a real effect on idle mixture, if you're running too rich the problem probably is somewhere else.